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Finding the Fourth Proportional to 1,254.92, 1,728.96 and 905

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Solution

The fourth proportional to 1,254.92, 1,728.96 and 905 is: 1,246.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.92 : 1,728.96 = 905 : x
  2. Step 2: Convert to fraction form
    1,254.92/1,728.96 = 905/x
  3. Step 3: Cross multiply
    1,254.92x = 1,728.96 × 905
  4. Step 4: Simplify right side
    1,254.92x = 1,564,708.80
  5. Step 5: Solve for x
    x = 1,564,708.80/1,254.92
  6. Step 6: Final answer
    x = 1,246.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.